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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 276593.0, MPI für Kernphysik / High-Energy Astrophysics
Prompt Optical Detection of GRB 050401 with ROTSE-IIIa
Authors:Rykoff, E.S.; Aharonian, F.; Akerlof, C. W.; Alatalo, K.; Ashley, M. C. B.; Güver, T.; Horns, Dieter; Krimm, H. A.; Kiziloglü, Ü.; McKay, T. A.; Özel, M.; Phillips, A.; Quimby, R. M.; Schaefer, B. E.; Smith, D. A.; Swan, H. F.; Vestrand, W. T.; Wheeler, J. C.; Wren, J.; Yost, S. A.; Barthelmy, S. D.; Gehrels, N.; Gögüs, E.
Research Context:gamma rays: bursts
Date of Publication (YYYY-MM-DD):2005-10-01
Title of Journal:The Astrophysical Journal
Issue / Number:2, part 2
Start Page:L212
End Page:L124
Copyright:The American Astronomical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detected prompt optical emission from Swift GRB 050401. We present observations of the early optical afterglow, first detected by the ROTSE-IIIa telescope 33 s after the start of gamma-ray emission, contemporaneous with the brightest peak of this emission. This GRB was neither exceptionally long nor bright. This is the first prompt optical detection of a GRB of typical duration and luminosity. We find that the early afterglow decay does not deviate significantly from the power-law decay observable at later times and is uncorrelated with the prompt gamma-ray emission. We compare this detection with the other two GRBs with prompt observations, GRB 990123 and GRB 041219a. All three bursts exhibit quite different behavior at early times.
Free Keywords:gamma rays: bursts
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Physics Department, University of Michigan, 2477 Randall Laboratory, 450 Church Street, Ann Arbor, MI 48109-1040
School of Physics, Department of Astrophysics and Optics, University of New South Wales, Sydney, NSW 2052, Australia
Istanbul University Science Faculty, Department of Astronomy and Space Sciences, 34119, University-Istanbul, Turkey
Department of Physics, Southern Methodist University, Dallas, TX 75275
Department of Physics, Middle East Technical University, Ankara 06531, Turkey
Department of Physics, Çanakkale Onsekiz Mart Üniversitesi, Terziolu 17020, Çanakkale, Turkey
Department of Astronomy, University of Texas, Austin, TX 78712
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803
Los Alamos National Laboratory, NIS-2, MS-D436, Los Alamos, NM 87545
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